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Provides classes that manage Bluetooth functionality on the device.
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The Bluetooth APIs allow applications can connect and disconnect headsets, or scan 
for other kinds of Bluetooth devices and pair them. Further control includes the 
ability to write and modify the local Service Discovery Protocol (SDP) database, 
query the SDP database of other Bluetooth devices, establish RFCOMM 
channels/sockets on Android, and connect to specified sockets on other devices.
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<p>Remember, not all Android devices are guaranteed to have Bluetooth functionality.</p>
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